Electrotyper&#39;s case



Patented May 12, 1925.

UNITED STATES WALKER W. MCCABROLL, OF NEW HAVEN, CONNECTICUT.

ELECTROTYPEBS CASE.

Application filed September To all whom it may concern:

Be it known that I. WVALKER W. MCCAR- ROLL; a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Electrotypers Cases, of which the .following is a specification.

This invention relates to electrotypers cases and more particularly pertains to an improvement upon my Patent No. 1,507,616 dated Sept. 9, 1924:.

In my aforesaid patent the case is disclosed as composed of a hard-rolled aluminum plate, the present invention aiming to preserve all of the many advantages derived from cases made in accordance with said patent, but at the same time to make same harder, stronger andof greater rigidity.

In the drawings Figure 1, is a top plan view of the inven' tion;

Figure 2, is a section on line 22 of Figure 1;

Figure 3, is a fragmentary plan view of the plate after preparation for and prior to the application of the wax facing, and

Figure 4, is a view similar to Figure 3, of a modified form of the invention.

In proceeding in accordance with the present invention the case is composed of a hard rolled plate composed of an aluminum base to which a small percentage of copper. manganese, magnesium, silver, tin or nickel is added. The invention comprehends the addition to the aluminum of any metal such as will strengthen and harden the plate and which at the same time will resist attack by the sulphuric acid in the plating solution, and accordingly zinc for example is not susceptible of use.

2% to 5% of copper; 1 to 2% of manganese; 1 to 10% magnesium: silver approximately 1%; nickel about 5% and tin about 1% when added to aluminum are found to greatly strengthen, harden and increase the rigidity of the case, although it should be expressly understood that the above specified instances of metals and proportions, are given by way of example and not exhaustive enumeration of all metals or proportions thereof. which be employed to strengthen, harden and. increase the ri 8, 1924. Serial No. 736,502.

gidity of the aluminum plate. In this regard it should be understood that the proportion of the metal added to the aluminum must not be such as will destroy the material advantage of light weight derived through the use of aluminum, which is an important factor as elaborated upon in my said application.

The plate 1 in the drawings is hard rolled, preferably by use of hot rolls in rolling down lengthwise and sidewise until a thickness of approximately inch is secured, after which the sheet is run through the cold rolls until it is reduced in thickness to about one-half its previous thickness, i. e., ths inch. to make the plate and wax facing heavier than the solution in which it is placed for deposition of the copper face, in order to insure the plate remaining well submerged in the electrolyte during the electrolytic action. It also greatly increases the rigidity of the plate, which is desirable.

This gives the plate sufficient density As in my aforesaid application .it is necessary to prepare a side face thereof for the reception of the melted wax 2 so as-to effect adherence thereof to the sheet. This may be accomplished in various manners, for example by filing or mechanically roughing the face as shown at 3 in Figure 4, or by chemically granulating or stippling the face as shown at 4 in Figure 8, for instance by application of hot lye.

WVhat is claimed is 1. An electrotypers case formed of a hard rolled plate composed of aluminum having 1 to 10% of a hardening metal incorporated therein.

2. An electrotypers case formed of a hard rolled plate composed of aluminum having 1 to 10% of a hardening metal incorporated thecilein resistant to the action of sulphuric acl 3. The hereindescribed method of making electrotypers cases which consists in alloying with aluminum from 1 to 10% of a hardening metaL and then in hard rolling the resultant aluminum alloy to such a degree that the same will remain well submerged in the electrolytic solution in which it is to be employed.

In testimony whereof I affix my signature. 

